Assembly step 1, Caution – Craftsman 139.53993D User Manual
Page 8
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ASSEMBLY STEP 1
Assemble the Rail
To avoid installation difficulties, do not run the
garage door opener until instructed to do so.
1 .Open the rail carton and remove the contents onto a
level work surface. Keep it clean and free of debris
while you are working.
2. Identify the rail sections and orient the sections on a
flat surface as shown. The back rail has a black gear
on one end. The header rail has a black plastic rack
inside the rail on the screw. The remaining section is
the center rail.
NOTE:
Use caution when handling the center rail
section. The screw can slip out If the section is tipped up
too far.
CAUTION
To prevent INJURY from pinching, keep hands and fingers
away from the joints while assembling the rail.
Remove Cardboard Packing